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Oya, Kaoru*; Inai, Kensuke*; Kikuhara, Yasuyuki*; Nakano, Tomohide; Kawata, Jun*; Kawazome, Hayato*; Ueda, Yoshio*; Tanabe, Tetsuo*
Journal of Plasma and Fusion Research SERIES, Vol.8, p.419 - 424, 2009/09
Redeposition of C
H
and CH
chemically eroded from carbon walls is simulated by EDDY code incorporated with the reflection on a hydrogenated and amorphized carbon surface. The redeposition rate for heavy hydrocarbons is drastically decreased by introduction of the reflection. The redeposition patterns on the surface are enlarged by the reflection, but it is narrower for the heavy hydrocarbons than for CH. The photon emissions of C from CH (CH) decay faster than that of CH from CH in high-temperature (
10 eV) plasmas, which reproduces the difference of the decay of the CD and C light intensities observed in the vicinity of the outer diverter plates of JT-60U. For such temperatures, the inverse photon-efficiency, which is defined as the ratio of the number of the launching hydrocarbons to the photoemission events of CH and C, is in good agreement with the values observed in JT-60U experiments.
Nishikino, Masaharu; Kawazome, Hayato*; Nagashima, Keisuke
Japanese Journal of Applied Physics, 47(2), p.983 - 985, 2008/02
Times Cited Count：7 Percentile：30.06(Physics, Applied)The highly brilliant X-ray source is one of promising tool for new scientific research. Since the first demonstration of a collisional pumped soft X-ray laser (XRL), which has been developed as a highly coherent X-ray source, the application research using the XRL beam has been progressed. A focused X-ray beam with a high intensity and a micron-order scale is expected to open various fields. We have demonstrated a submicron soft X-ray beam using a Fresnel phase zone plate (FPZP) with a highly efficiency of first-order diffraction X-rays. The highly coherent XRL at wavelength l of 13.9 nm is focused to a 0.5-
m spot size at full width of half maximum (FWHM) with a peak intensity of about 10
W/cm
.
Nishikino, Masaharu; Tanaka, Momoko; Kawazome, Hayato; Kawachi, Tetsuya; Sasaki, Akira; Hasegawa, Noboru; Ochi, Yoshihiro; Kishimoto, Maki; Nagashima, Keisuke; Onishi, Naofumi*
AIP Conference Proceedings 827, p.499 - 504, 2006/04
no abstracts in English
Kawachi, Tetsuya; Nagashima, Keisuke; Kishimoto, Maki; Hasegawa, Noboru; Tanaka, Momoko; Ochi, Yoshihiro; Nishikino, Masaharu; Kawazome, Hayato; Tai, R.; Namikawa, Kazumichi*; et al.
Proceedings of SPIE's International Symposium on Optics and Photonics 2005, Vol.5919, p.59190L_1 - 59190L_11, 2005/09
Recent results of the X-ray laser research in Advanced Photon Research (APR) Center in JAERI are reported. In the application of the nickel-like silver laser at a wavelength of 13.9 nm, we report the observation of the microscopic polarization clusters in ferroelectrics material such as BaTi03 by use of the X-ray speckle technique, and other experiments such as photo-ionization of inner-shell electrons are intoroduced. In the development of high quality X-ray laser beam, recently we demonstrated temporally coherent X-ray beam at 23.6 nm, in which the high-order harmonics light was injected into the Ne-like Mn X-ray amplifier. We also mention about the development of new X-ray laser driver laser, which is based on 2 beams of zig-zag slab Nd:glass lasers with 0.1 Hz repetition-rate, and each beam line can provide 10 J output energy, and 1 ps duration.
Nishikino, Masaharu; Kawazome, Hayato; Tanaka, Momoko; Kishimoto, Maki; Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Nagashima, Keisuke
IPAP Conference Series 7 (Proceedings of 8th International Conference on X-ray Microscopy (XRM 2005)), p.423 - 425, 2005/00
no abstracts in English
Kawachi, Tetsuya; Hasegawa, Noboru; Tanaka, Momoko; Ochi, Yoshihiro; Nishikino, Masaharu; Kawazome, Hayato; Sukegawa, Kota*; Kishimoto, Maki; Nagashima, Keisuke
no journal, ,
Recent progress in laser-driven X-ray laser research in JAEA is reported. In the application of the X-ray lasers, surface information of the ferroelectric material has been obtained by use of X-ray laser speckle technique. In the development of the X-ray lasers we have demonstrated substantial lasing at a wavelength of 18.8 nm with the pumping energy of around 2 J by use of grazing incidence pumping scheme. We have also progress in the development of the driver IR laser with repetition rate of 0.1 Hz, which make it possible to realize high-repetition rate fully coherenrt X-ray laser.
Nishikino, Masaharu; Tanaka, Momoko; Onishi, Naofumi*; Kawachi, Tetsuya; Nagashima, Keisuke; Kawazome, Hayato; Kishimoto, Maki; Hasegawa, Noboru; Ochi, Yoshihiro
no journal, ,
no abstracts in English
Nishikino, Masaharu; Kawazome, Hayato; Tanaka, Momoko; Kishimoto, Maki; Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Sukegawa, Kota; Yamatani, Hiroshi; Nagashima, Keisuke; et al.
no journal, ,
We have developed a fully coherent X-ray laser at 13.9 nm and the application research has been started. The submicron X-ray beam can be generated by the soft X-ray laser with using optical elements. The theoretical calculation shows that it is expected to obtain the spot diameter of about 300 nm with a Fresnel zone plate. The submicron X-ray beam is used as the X-ray source for the Fourie-transform holography and the local irradiation of the material. The focusibility of the X-ray beam and the application research using the submicron X-ray beam will be presented.
